TY - JOUR
T1 - Comparison of Pt and Pd catalysts for hydrogen pump separation from reformate
AU - Wu, Xuemei
AU - Benziger, Jay
AU - He, Gaohong
N1 - Funding Information:
The authors thank the NSF ( CBET 0754715 ) for support of this work. Dr. Wu thanks the NSFC ( 21176044 ) and the Chinese Scholarship Council for support to work at Princeton University. The authors thank May Jean Cheah for her assistance in preparing membrane electrodes and building up the experimental setup in this work.
PY - 2012/11/15
Y1 - 2012/11/15
N2 - Hydrogen recovery from CO 2/H 2 reformate mixtures by selective electrochemical pumping was compared from carbon supported Pt and Pd catalysts. Catalyst coated membranes were prepared by air-brushing a suspension of commercially available 20 wt% Pt/C or 20 wt% Pd/C catalysts and solubilized Nafion in methanol onto Nafion 115 membranes. Electrochemical activity and separation efficiency for the different catalyst layer formulations were evaluated by cyclic voltammetry, polarization and potentiostatic hydrogen pumping. The effective membrane-electrode-assembly (MEA) resistance increased due to dilution of H 2 by CO 2; the effective MEA resistance was greater for Pd/C catalysts than for Pt/C catalysts. CO 2 adsorbed more strongly to Pd catalysts than Pt catalysts reducing the electrochemical active surface area available for hydrogen oxidation/reduction. Pd/C catalysts had an energy efficiency for hydrogen recovery from reformate mixtures approximately 80% that of Pt catalysts. Because Pd is ten times less costly than Pt the results presented here suggest that Pd/C catalysts would be a promising candidate for hydrogen pumps to recover H 2 from reformate mixtures.
AB - Hydrogen recovery from CO 2/H 2 reformate mixtures by selective electrochemical pumping was compared from carbon supported Pt and Pd catalysts. Catalyst coated membranes were prepared by air-brushing a suspension of commercially available 20 wt% Pt/C or 20 wt% Pd/C catalysts and solubilized Nafion in methanol onto Nafion 115 membranes. Electrochemical activity and separation efficiency for the different catalyst layer formulations were evaluated by cyclic voltammetry, polarization and potentiostatic hydrogen pumping. The effective membrane-electrode-assembly (MEA) resistance increased due to dilution of H 2 by CO 2; the effective MEA resistance was greater for Pd/C catalysts than for Pt/C catalysts. CO 2 adsorbed more strongly to Pd catalysts than Pt catalysts reducing the electrochemical active surface area available for hydrogen oxidation/reduction. Pd/C catalysts had an energy efficiency for hydrogen recovery from reformate mixtures approximately 80% that of Pt catalysts. Because Pd is ten times less costly than Pt the results presented here suggest that Pd/C catalysts would be a promising candidate for hydrogen pumps to recover H 2 from reformate mixtures.
KW - Electrocatalyst coated membranes
KW - Electrochemical separations
KW - Hydrogen purification
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U2 - 10.1016/j.jpowsour.2012.07.002
DO - 10.1016/j.jpowsour.2012.07.002
M3 - Article
AN - SCOPUS:84864797358
SN - 0378-7753
VL - 218
SP - 424
EP - 434
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -